在我的reducer中读取属性值

// 定义初始状态
const initialState = {
  count: 0,
  username: '',
  isLoggedIn: false
};

// 定义reducer函数
const reducer = (state = initialState, action) => {
  switch (action.type) {
    case 'INCREMENT':
      return {
        ...state,
        count: state.count + 1
      };
    case 'SET_USERNAME':
      return {
        ...state,
        username: action.payload
      };
    case 'LOG_IN':
      return {
        ...state,
        isLoggedIn: true
      };
    default:
      return state;
  }
};

// 在应用中使用reducer
// 创建store并传入reducer
const store = createStore(reducer);

// 读取属性值
const count = store.getState().count;
const username = store.getState().username;
const isLoggedIn = store.getState().isLoggedIn;